undefined method `tire' for class

[mahilock]

hi,
I just added this gem to my project and tried to execute elastic_ransack on a model but I got below error
NoMethodError: undefined method `tire' for #Class:0x0055bfe7fbdb08
I am using ruby 2.2.6 & rails 4.2
below is the console output

2.2.6 :058 > Complaint.elastic_ransack({text_cont: "ho"}, load: true) NoMethodError: undefined method tire' for #Class:0x0055bfe7fbdb08
from /home/mnd/.rvm/gems/ruby-2.2.6/gems/activerecord-4.2.4/lib/active_record/dynamic_matchers.rb:26:in method_missing' from /home/mnd/.rvm/gems/ruby-2.2.6/gems/elastic_ransack-0.0.1/lib/elastic_ransack/search.rb:100:in method_missing'
from /home/mnd/.rvm/gems/ruby-2.2.6/gems/elastic_ransack-0.0.1/lib/elastic_ransack/search.rb:42:in search' from /home/mnd/.rvm/gems/ruby-2.2.6/gems/elastic_ransack-0.0.1/lib/elastic_ransack/model.rb:44:in elastic_ransack'
from (irb):58
from /home/mnd/.rvm/gems/ruby-2.2.6/gems/railties-4.2.4/lib/rails/commands/console.rb:110:in start'

I have Complaint model as
class Complaint < ActiveRecord::Base include ElasticRansack::Model end

Please help resolving the issue